Locking device for swiveling casing hooks



Aug. 15, 1933 B. s. MINOR LOCKING DEVICE FOR SWIVELING CASING HOOKSFiled June 10, 1932 objects.

Patented Aug. 15, 1933 a t I: UNITED s A s PATEN CE, 1

, -1,922,3s6 1 V V LOCKING. DEVICE FOR SWIVELING CASING, I HOOKS I IBurt S. Minor, San Pedro, California V Application June 10, 1932.seriarn 616,44811 1 Claim. ,(01. 2 44p) f prevent twisting of thetravellingv block and linesr 10 passing therefrom to the crown block. Onthe other hand, when the swivel is used the hook should be locked sothat the kelly and drill pipe will turn in the swivel in order toprevent twist-.

. ing of the hose connected thereto.

On account of the heavy loads imposedon hooks of the above character,they are consequently of such weight that they cannot be manually liftedor carried from one-place to another, it being necessary to move or dragthem with suitable I tackle h i II It has been found that attachmentssuch as a,

locking device (to which'this invention relates) very frequently becomebroken or damaged during moving of the hook, especially-so if such partsare exposed. i The object of thisinvention-is to provide; a

locking device for swivel hooks constructed in such aimanner that itsworking parts areprotected against damage throughcontact with other forswivel hooks of a simple construction, which may be installedwithoutmaterially altering the general construction of the hook, and which may5 be easily and quickly-operated. I V v I Other objects and advantageswill be apparent from'the following description, reference being had 'tothe accompanying drawing, in'whichz' Fig. 1 a side elevation of a'swivel hook pro- 1 vided with the improved locking device asit appearswith the locking boltfin released position.

tdfpermitqswivelingof-the hook proper, parts being broken away and shownin-section.

Fig. 2' is a horizontal section taken substantially -on line 22 ofFig; 1. T I I Fig. 3 isa VieW analogous'toFig. 1,

the bolt in locked position.

Fig. 4 is'a section taken on line slidably mounted .in a block 12,'andpivotally mountedonoppositely disposed trunnions 13 pro jectingfrom theblock; is a'bail 14 adapted to be onnected to a 'travellinglblock (notjshownlof the usual hoisting'apparatus employed in a well a r drillingrigs a Encircling the shank coil spring 16 whiclr j serves as ashockabsorber,' ;also to automatically liftastandor section ofdrill pipe whenitisun- Further objects are to provide a locking deviceshank 11 extends.

but with screwed from the pipe in the, hole in order to I prevent damageto the screw threads of the pin and box of the tool'joints. Theopposite'ends of the spring engage the face of, arecess formedin theblock and the bottom race 17 of. an anti-v friction thrust bearing 18respectively, and screw threaded onthe upper end of the shank is a nutor cap which engages the upper race 21 ofsaid hearing. A shoulder orabutment 22, formed on the shank below the blockj limits its upwardmovement againstexpansion of said spring. The parts above describedoperate in the same man'--.

patent issued to Wilson B. Wigle;

The present invention resides in the device constructeda's follows:Slidably mounted ina bore formed in block 1 locking 12, preferably inonev corner, is a' push pin 24 whichserves to actuate a locking bolt 25,the- I :pin being held against rotation by a stud 26.

neras the apparatus disclosed'in a-United'states projectingtherefrominto av groove 27 formed in A the faceof the bore.

1 The locking. bolt is slidably mounted in a recess 28 communicatingwith the aforesaid bore, and is provided with a tapered head 29 urgedinto engagement with afnotch 30 formed in 1pin.24

by anexpansion-coil spring 31 which encircles the bolt, the oppositeends of said spring engaging the head and inner face. of the recessrespective- 1y.( The bolt being slidably mounted in an opening;32communicating with the recess, and the opening in block 12 through whichthehook the pin with asuitable tool such as a hammer.

For example, when. it is desired to lock the hook against rotationvthepin is driven downwardly,

" I claim:

In a hook 'of the characterdescribed, a block,

a hook having a shank with a groove formed thereinslidably and rotatablymounted in said. 4-4 of Fig. 3. l Referring more specifically to thedrawing-[10* I -5 designates the hook proper which is formed in tegralwith a cylindrical shank ll' 'rotatablyandi block, apinhaving a notchformed therein slidably mounted in .a bore formed in said block, a.

it will be seen that by 'the actionofwhichforces the bolt into'enga'gement with'thegroove as shown in Figs. 3 and 4,

mounted in arecess formed in saidblock; and an 5 expansion springnormally-urging the head of said locking bolt into engagement withthenotch 'Iforrned' in said pin and outof' engagement with, I

"the grooveformed in theshank, j,

- I LBURT S. m oR;

